They measure resistance from old hardliners, misjudging some initially (4)
I believe the answer is:
ohms
'they measure resistance' is the definition.
The definition suggests an adverb but the answer is not.
'old hardliners misjudging some initially' is the wordplay.
'initially' suggests taking the first letters.
The first letters of 'old hardliners misjudging some' is 'OHMS'.
'from' acts as a link.
Can you help me to learn more?
(Other definitions for ohms that I've seen before include "Frank marking" , "Units of electrical resistance" , "degrees of resistance" , "lab units" , "Measure of resistance" .)